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on July 31, 2010 at 6:00 AM. Associated PressPowdery mildew is a common fungus disease on many types of plants, including peonies like the ones above. Dear Carol: For the past two years, my peonies have gotten white spots on the leaves. This happens after they have finished blooming.
If there is a particular source of heat that is harming the plant (like a hot grow light), you'll know because the leaves closest to the source of the problem will wilt and turn a brownish color. Heat or light-stressed leaves/buds can also get bleached and appear pale or white.